Direct-current electric energy metering method and device based on temperature field

Abstract

The invention provides a direct-current electric energy metering method and device based on a temperature field. The direct-current electric energy metering method comprises the following steps: identifying a direct-current electric device in electric equipment, performing noise reduction processing on real-time current in the direct-current electric device to obtain device noise reduction current, inquiring device parameters of the direct-current electric device, and calculating a device current value corresponding to the device noise reduction current; calculating a heat value corresponding to a device current value, obtaining a current heat value, constructing a corresponding device thermogram, extracting material characteristics of the direct current device, constructing a wind field vector diagram according to the material characteristics and device parameters, and further obtaining a target device thermogram; analyzing the mapping relation between the environment temperature of the electric equipment and the metering accuracy, determining the compensation temperature of the thermogram of the target equipment, metering the direct-current electric energy of the electric equipment, and obtaining the metering data, thereby improving the accuracy of electric energy metering, facilitating the monitoring of the operation state of the equipment, optimizing the layout and design of the equipment, and improving the working efficiency. Therefore, the improvement of energy management and equipment operation efficiency is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy metering, and in particular to a direct current electric energy metering method and device based on temperature field. Background Art

[0002] The existing DC electric energy metering method is mainly implemented through the voltage-current integration method. For example, CN117554690A "DC electric energy metering method, DC electric energy metering device and equipment" provides a "DC electric energy metering method, DC electric energy metering device and equipment, belonging to the field of electronic circuit technology. The DC electric energy metering method includes: obtaining a calibration sequence of a current collector and a first voltage obtained by real-time collection by the current collector, the calibration sequence includes multiple calibration voltages; based on the size of the first voltage, determining a first calibration voltage and a second calibration voltage from the multiple calibration voltages; based on the first calibration voltage and the second calibration voltage, determining the calibration parameters of the first voltage; obtaining the second voltage obtained by real-time collection of the voltage collection circuit; based on the first voltage, the calibration parameters and the second voltage, determining the electric energy metering result", the application determines that the electric energy metering result is mainly "quasi-current With the second voltage The product of is the power value p at the current moment, the power value at each moment is continuously recorded, and the power value is integrated to obtain the electric energy measurement result". The application ignores the temperature influence on the DC power-consuming equipment during operation. When the ambient temperature of the power-consuming equipment changes, it will directly affect its working performance. For example, the resistance value, conductivity, etc. will change with the temperature, thereby causing the electrical characteristics of the equipment to change. Without considering the temperature factor, the electric energy measurement result cannot accurately reflect the actual electric energy measurement situation. Therefore, a method based on the temperature field that can improve the accuracy of DC power measurement is needed. Summary of the invention

[0003] The present invention provides a direct current electric energy metering method and device based on temperature field, the main purpose of which is to improve the accuracy of direct current electric energy metering based on temperature field.

[0004] To achieve the above object, the present invention provides a DC electric energy metering method based on temperature field, comprising: Obtain the electrical equipment and equipment access voltage of the DC electric energy to be measured, identify the DC devices in the electrical equipment, perform noise reduction processing on the real-time current of the DC devices, obtain the device noise reduction current, query the device parameters of the DC devices, and calculate the device current value corresponding to the DC devices according to the device noise reduction current, the equipment access voltage and the device parameters; Calculate the corresponding current calorific value according to the device current value, and construct a device thermal image according to the current calorific value; extract the material properties of the DC device, construct a wind field vector diagram according to the material properties and device parameters, and update the device thermal image according to the wind field vector diagram to obtain a target device thermal image; Acquire historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

[0005] As a preferred embodiment of the present invention, the identification of DC devices in electrical equipment is specifically as follows: Obtaining a real-time current value of each device in the electrical equipment through real-time detection, drawing a corresponding device current scatter diagram according to the real-time current value, and performing fitting processing on the device current scatter diagram to obtain a fitted current diagram; The image slope of the fitted current graph is calculated and expressed as: ; In the formula, represents the slope of the image of the fitted current graph, and Indicates the coordinates corresponding to the first real-time current in the fitted current diagram, represents the slope of the image line segment between the first real-time current and the second real-time current, and Indicates the coordinates corresponding to the nth real-time current in the fitted current graph, where n represents the number of real-time currents; The direct current components in the electrical equipment are determined according to the image slope.

[0006] As a preferred embodiment of the present invention, the real-time current of the DC device is subjected to noise reduction processing to obtain the device noise reduction current as follows: Extracting the current signal of the real-time current of the DC device, calculating the wavelet coefficient corresponding to each signal in the current signal, and obtaining the signal wavelet coefficient; Performing shrinkage processing on the wavelet coefficients of the signal to obtain a threshold coefficient in the signal; According to the threshold coefficient in the signal, the real-time current in the DC device is subjected to median filtering to obtain the device noise reduction current.

[0007] As a preferred implementation of the present invention, the device current value corresponding to the DC device is calculated based on the device noise reduction current, the device access voltage and the device parameters as follows: Determine the device resistance of the resistor device in the DC device according to the device parameters, and query the service life of the resistor device; According to the use cycle, the loss coefficient of the resistor device is searched from a preset resistance cycle loss table, and the actual device resistance of each device in the DC device is determined according to the loss coefficient and the device resistance; Obtaining a circuit topology diagram of an electrical device, and analyzing the device relationship of the DC devices according to the circuit topology diagram; The connection mode of the DC device is determined by the device relationship, and the device current value is calculated using different device current formulas according to the different connection modes of the DC device, wherein: if the connection mode is series connection, the device current calculation formula is: I=U / R, where I is the device current, U is the device access voltage, and R is the actual device resistance; if the connection mode is parallel connection, the device current calculation formula is: I=U / R1+R2 Rm, where Rm represents the actual device resistance of the mth device.

[0008] As a preferred embodiment of the present invention, the corresponding current calorific value is calculated according to the device current value, and the device thermal image is constructed according to the current calorific value, specifically: In the formula, Q represents the current heat value, represents the device current value, R represents the actual resistance device value corresponding to the DC device, and t represents the time for the current to pass through the DC device; Performing hierarchical grid processing on the electrical equipment to obtain an equipment grid, and constructing a simulated grid diagram of the electrical equipment based on the equipment grid; Querying the grid name corresponding to the device grid, and setting the temperature range corresponding to the device grid according to the current heat value; In combination with the simulated grid diagram, the grid name and the temperature range, a device thermal image template of the electrical device is generated, wherein the device thermal image template is color rendered according to the temperature range to obtain a device thermal image corresponding to the electrical device.

[0009] As a preferred implementation of the present invention, a wind field vector diagram is constructed according to material properties and device parameters, specifically: Extracting physical and chemical properties from the material properties, and calculating the radiation consumption coefficient of each DC device in the electrical equipment according to the chemical properties; Calculating the radiation absorption rate of each DC device in the electrical equipment according to the physical characteristics; determining the device thickness according to the device parameters; Calculate the heat absorption coefficient by combining the radiation consumption coefficient, the radiation absorption rate and the device thickness; Calculating the difference in heat absorption coefficients of adjacent DC electrical devices in the electrical equipment based on the heat absorption coefficients; The air flow rate of adjacent DC components in the electrical equipment is determined according to the difference in heat absorption coefficients, and a wind field vector diagram inside the electrical equipment is constructed according to the air flow rate.

[0010] As a preferred embodiment of the present invention, the radiation consumption coefficient is calculated using the formula: ; In the formula, is the radiation consumption coefficient, is the Stefan-Boltzmann constant, P is the heat transfer coefficient in chemical properties; The calculation of radiation absorption rate is expressed as: ; In the formula, Indicates the radiation absorption rate of each DC device in the electrical equipment. represents the heat transfer coefficient in the physical properties, y represents the device serial number of each DC device in the electrical equipment, Indicates the current value of the yth device in the electrical equipment, Indicates the resistance value of the yth device in the electrical equipment, Indicates the operating frequency of the yth device in the electrical equipment.

[0011] As a preferred embodiment of the present invention, the heat absorption coefficient of each DC device in the electrical equipment is calculated by combining the radiation consumption coefficient, the radiation absorption rate and the device thickness, and is expressed as follows: ; In the formula, The heat absorption coefficient of the jth device in the electrical equipment, where j represents the device serial number of the electrical equipment. represents the device thickness corresponding to the jth device, represents the radiation consumption coefficient corresponding to the jth device, Represents the radiation absorption rate corresponding to the jth device.

[0012] As a preferred embodiment of the present invention, the DC power of the electrical equipment is measured according to the compensation temperature and the thermal image of the target equipment, specifically: Measuring the device area of ​​the thermal image of the target device and reading the distributed temperature value in the thermal image of the target device; Calculating the temperature gradient corresponding to the thermal image of the target device according to the distributed temperature value; Combining the temperature gradient and the device area, the overall heat loss of the target device thermal image is calculated and expressed as: ; Among them, Y represents the overall heat loss of the target device thermal image, k represents the thermal conductivity of the device, s represents the area of ​​the device, represents the temperature gradient, The electric energy conversion rate corresponding to the electric device is queried, and the DC electric energy of the electric device is measured by combining the overall heat loss of the thermal image of the target device and the electric energy conversion rate, which is expressed as follows: ; Among them, M represents the DC power of the electrical equipment, Indicates the effective output power of the electrical equipment. Indicates the effective input power of the electrical equipment.

[0013] The present invention also provides a DC electric energy metering device based on temperature field, the device comprising: A device screening module, used to obtain the electrical equipment and device access voltage of the DC electric energy to be measured, identify the device components in the electrical equipment, obtain the real-time current value of each device in the device components through real-time detection, and determine the DC devices in the device components according to the real-time current value, wherein the determining the DC devices in the device components according to the real-time current value specifically comprises drawing a current scatter plot of each device in the device components according to the real-time current value, fitting the current scatter plot to obtain a fitted current graph; calculating the image slope of the fitted current graph, analyzing the image slope, and determining the DC devices in the electrical equipment; A current calculation module, used to perform noise reduction processing on the device current in the DC device, obtain the device noise reduction current, query the device parameters of the DC device, and calculate the device current value corresponding to the DC device according to the device noise reduction current, equipment access voltage and device parameters; The device thermal image construction module is used to calculate the current calorific value corresponding to the current value of the device, and construct the corresponding device thermal image according to the current calorific value; extract the material properties of the DC device, and construct a wind field vector diagram according to the material properties and device parameters; update the device thermal image according to the wind field vector diagram to obtain the target device thermal image; A DC power metering module is used to obtain historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

[0014] Beneficial Effects 1) The present invention provides a DC power metering method and device based on temperature field, which reduces the influence of external interference and noise on current data by performing noise reduction processing on real-time current in DC devices, thereby improving the accuracy and stability of data; by querying the parameters of DC devices, calculating the current value corresponding to the device noise reduction current and calculating the corresponding heat value, the power consumption of DC devices is more accurately evaluated, and the accuracy of measurement is improved. 2) The present invention provides a method and device for measuring direct current electric energy based on temperature field, which constructs a thermal image of the equipment according to the obtained current calorific value, intuitively displays the heat distribution of each part inside the equipment, and helps to monitor and optimize the working status of the equipment; 3) The present invention provides a DC power metering method and device based on temperature field, which constructs a wind field vector diagram in combination with the material characteristics and device parameters of DC devices to understand the air flow inside the equipment and provide a reference for further optimizing the equipment layout and heat dissipation design; 4) The present invention provides a DC electric energy metering method and device based on temperature field, analyzes the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy, determines the compensation temperature of the thermal image of the target equipment, and helps to maintain the accuracy of the metering data under different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a flow chart of a DC electric energy metering method based on a temperature field provided in the first embodiment of the present invention; Figure 2 A functional module diagram of a DC electric energy metering device based on temperature field provided in the second embodiment of the present invention; Figure 3 A schematic diagram of the structure of an electronic device for implementing the DC power metering method based on temperature field provided in the third embodiment of the present invention; In the figure: 100-direct current power metering device; 101-device screening module; 102-current calculation module; 103-heat cloud map construction module; 104-direct current power metering module; 1-electronic device; 10-processor; 11-memory; 12-communication bus; 13-communication interface. DETAILED DESCRIPTION

[0016] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0017] Embodiment 1 The embodiment of the present invention provides a DC electric energy metering method based on a temperature field. In the embodiment of the present invention, the execution subject of the DC electric energy metering method based on a temperature field includes but is not limited to at least one of the electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiment of the present invention. In other words, the DC electric energy metering method based on a temperature field can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, etc. The server can be an independent server, or it can be a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), and basic cloud computing services such as big data and artificial intelligence platforms.

[0018] Reference Figure 1 FIG. 1 is a flow chart of a method for measuring direct current electric energy based on a temperature field according to an embodiment of the present invention. In this embodiment, the method for measuring direct current electric energy based on a temperature field includes steps S1 to S4.

[0019] S1. Obtain the DC power consumption equipment and equipment access voltage to be measured, and identify the DC components in the power consumption equipment: The present invention obtains the electrical equipment of the DC electric energy to be measured, and then identifies the equipment components in the electrical equipment to understand the internal components of the electrical equipment; obtains the device access voltage corresponding to the electrical equipment to understand the voltage condition in the access equipment, which is convenient for the subsequent calculation of the device current of the DC electric device, wherein the electrical equipment is a device that needs DC electric energy, such as a motor and an electric heating device, etc., the device access voltage corresponding to the electrical equipment is the voltage corresponding to the normal use of the electrical equipment, and the equipment components are the components inside the electrical equipment, such as the stator core shaft, rotor core shaft, stator iron core and rotor iron core components inside the motor, further, the device access voltage corresponding to the electrical equipment can be detected by a voltmeter, and the identification of the equipment components in the electrical equipment can be achieved by a device identification tool, such as EMC2000 identification software.

[0020] Furthermore, the present invention detects the device current of each device in the device in real time to understand the real-time current value change of each device in the device, so as to facilitate the subsequent determination of the DC devices in the device, wherein the real-time current value is the current value detected in real time for each device in the device. Furthermore, real-time detection of the current value of each device in the device can be achieved by an ammeter.

[0021] The present invention determines the DC components in the equipment and devices based on the real-time current value, and then removes the components using AC power in the equipment and devices, so as to improve the accuracy of subsequent DC power measurement, wherein the DC components are components using DC power in the equipment and devices.

[0022] As an embodiment of the present invention, the determining of the DC components in the equipment components according to the real-time current value is specifically: According to the real-time current value, a current scatter diagram of each device in the equipment device is drawn, the current scatter diagram is fitted to obtain a fitted current diagram, the image slope of the fitted current diagram is calculated, and the DC device in the equipment device is determined according to the image slope.

[0023] Among them, the current scatter plot is an image drawn according to the numerical value of the real-time device current value, the fitted current graph is an image obtained by connecting each point in the current scatter plot through a fitting curve, and the image slope is the slope of the line segment in the fitted current graph. Further, drawing the current scatter plot of each device in the equipment device can be achieved through drawing software, such as GraphPad Prism. GraphPad Prism is a scientific drawing software widely used in data analysis and drawing. Fitting the current scatter plot through GraphPad Prism can be achieved through a fitting function, and determining the DC device in the equipment device can be based on the image slope.

[0024] Further, as an optional embodiment of the present invention, the calculating the image slope of the fitted current graph includes: The image slope of the fitted current graph is calculated by the following formula: ; in, represents the slope of the image of the fitted current graph, and Indicates the coordinates corresponding to the first real-time device current value in the fitting image, represents the slope of the graph line segment between the first real-time device current value and the second real-time device current value, and Represents the coordinates corresponding to the nth real-time device current value in the fitting image, where n represents the number of real-time device current values.

[0025] The DC components in the electrical equipment are determined based on the image slope. Specifically, if the image slope is a stable constant value, and is positive or negative, it indicates a stable current change in the DC circuit; if the image slope changes periodically, with positive and negative values ​​appearing alternately, it indicates a current change in the AC circuit; preferably, during the analysis process, the characteristics of the DC circuit are considered, wherein: the current or voltage in the DC circuit remains unchanged or changes steadily, so the image slope is usually constant, and components in the DC circuit are commonly found in power supplies, batteries, voltage regulators, etc., and are used to provide a fixed current or voltage.

[0026] S2. Perform noise reduction processing on the real-time current of the DC device to obtain the device noise reduction current, query the device parameters of the DC device, and calculate the device current value corresponding to the DC device according to the device noise reduction current, equipment access voltage and device parameters.

[0027] S21. The present invention can remove interference and noise in the real-time current of the DC device by performing noise reduction processing on the real-time current in the DC device, thereby improving the calculation accuracy of subsequent device current values, wherein the device noise reduction current is the current obtained after the device current is subjected to noise reduction processing.

[0028] As an embodiment of the present invention, the noise reduction process is performed on the device current in the DC device to obtain the device noise reduction current. Specifically, Extracting the current signal of the real-time current of the DC device, calculating the wavelet coefficient corresponding to each signal in the current signal, and obtaining the signal wavelet coefficient; Performing shrinkage processing on the wavelet coefficients of the signal to obtain a threshold coefficient in the signal; According to the threshold coefficient in the signal, the real-time current in the DC device is subjected to median filtering to obtain the device noise reduction current.

[0029] Among them, the current signal is a digital signal corresponding to the real-time current of the DC device, the signal wavelet coefficient is a set of numbers used in wavelet analysis to describe the characteristics of the current signal at different scales and positions, and the threshold coefficient in the signal is the coefficient obtained after the signal wavelet coefficient is contracted. Furthermore, the current signal of the device current in the DC device can be extracted by a signal extractor, and the signal extractor is compiled by a script language. The median filtering of the device current in the DC device can be achieved by a high-pass filter.

[0030] Further, as an optional embodiment of the present invention, the calculating the wavelet coefficient corresponding to each signal in the current signal to obtain the signal wavelet coefficient includes: The wavelet coefficient corresponding to each signal in the current signal is calculated by the following formula: ; In the formula, The wavelet coefficient corresponding to the i-th signal in the current signal, is the continuous time signal in the current signal, * (t) represents the wavelet basis function, represents the conjugate of the wavelet basis with the i-th signal scale g and time shift h, and They represent the scale and location parameters of the i-th signal respectively.

[0031] Further, as an optional embodiment of the present invention, the shrinking process is performed on the wavelet coefficients of the signal to obtain the threshold coefficients in the signal, including: The signal wavelet coefficients are shrunk by the following formula: ; In the formula, Represents the threshold coefficient in the signal obtained after the signal wavelet coefficients are shrunk. () indicates a symbol-returning function, Represents the mth signal wavelet coefficient of the nth layer, n represents the number of layers of wavelet decomposition, and m represents the serial number of the signal wavelet coefficient. Represents the threshold of the signal wavelet coefficients.

[0032] S22. The present invention calculates the device current value corresponding to the device noise reduction current by querying the device parameters of the DC device and combining the device access voltage and the device parameters, so as to understand the relevant information of the DC device and facilitate the calculation of the device current value, wherein the device parameters are the introduction information corresponding to the DC device, such as device specifications and dimensions and device materials, etc., and the device current value is the actual current value corresponding to the device noise reduction current. Furthermore, the query of the device parameters of the DC device can be achieved through human-computer interaction from the Internet.

[0033] As an embodiment of the present invention, the device current value corresponding to the DC device is calculated according to the device noise reduction current, the equipment access voltage and the device parameters as follows: According to the device parameters, the device resistance of the resistor device in the DC device is determined, and the service life of the resistor device is queried. According to the service life, the loss coefficient of the resistor device is queried from a preset resistance cycle loss table, wherein the resistor device is a resistor in the DC device, the device resistance is the resistance value of the resistor device, the service life is the service time of the resistor device, and the preset resistance cycle loss table is a mapping relationship table of time and loss ratio obtained by analyzing a large number of resistor service times and resistance value changes, and the loss coefficient represents the loss degree of the resistor device; further, the device resistance of the resistor device in the DC device can be determined by extracting it from the device parameters, Determine the real device resistance of each device in the DC device according to the loss coefficient and the device resistance, wherein the real device resistance is the real resistance value of each device in the DC device; further, determine the real device resistance of each device in the DC device according to the product of the loss coefficient and the device resistance; Obtaining a circuit topology diagram of the electrical equipment, and analyzing the device relationship of the DC devices according to the circuit topology diagram, wherein the circuit topology diagram is a circuit diagram of device connections in the electrical equipment, and the device relationship is the relationship between the DC devices, such as series connection or parallel connection; further, obtaining the circuit topology diagram can be achieved through the relevant instructions of the electrical equipment, and the device relationship of the DC devices can be obtained by analyzing the circuit topology diagram using a node method; The device current corresponding to the device noise reduction current is calculated based on the device relationship, the actual device resistance and the device access voltage. Furthermore, the device current of the DC device is first determined by the device relationship to determine whether the DC device is connected in parallel or in series, and then calculated using different calculation formulas. If the DC device is connected in series, the device current calculation formula is: I=U / R, where I is the device current, U is the device access voltage, and R is the actual device resistance. If the DC device is connected in parallel, the device current calculation formula is: I=U / R1+R2 Rm, Rm represents the actual device resistance of the mth device.

[0034] S3. Calculate the calorific value corresponding to the current value of the device to obtain the current calorific value, construct a device thermal image corresponding to the electrical equipment based on the current calorific value, extract material properties of the electrical equipment, construct a wind field vector diagram inside the electrical equipment based on the material properties and device parameters, and update the device thermal image based on the wind field vector diagram to obtain a target device thermal image.

[0035] S31. The present invention can obtain the specific heat value corresponding to the device current value by calculating the heat value corresponding to the device current value, so as to facilitate the subsequent construction of the device thermal image, wherein the current heat value is the heat value corresponding to the device current value, and further, the heat value calculation formula corresponding to the device current value is: Q = Rt, where Q represents the current heat value, represents the device current value, R represents the actual resistance device value corresponding to the DC device, and t represents the time the current passes through the DC device.

[0036] The present invention constructs a device thermal image corresponding to the electrical device based on the current calorific value, and can obtain a distribution map of the current calorific value to form a temperature field, which can subsequently provide convenience for measuring direct current power, wherein the device thermal image is a heat distribution image of the electrical device constructed based on the current calorific value.

[0037] As an optional embodiment of the present invention, constructing a device thermal image corresponding to the electrical device according to the current calorific value is specifically as follows: The electrical equipment is subjected to hierarchical gridding to obtain an equipment grid, and a simulated grid diagram of the electrical equipment is constructed based on the equipment grid, wherein the equipment grid is a grid obtained by hierarchical gridding of internal devices of the electrical equipment according to shape and layout, and the simulated grid diagram is a three-dimensional grid diagram of the electrical equipment composed of the equipment grid; further, the hierarchical gridding of the electrical equipment can be implemented by a multi-grid method, and the construction of the simulated grid diagram of the electrical equipment can be implemented by a three-dimensional composition software, such as a CAD tool; Query the grid name corresponding to the device grid, and set the temperature range corresponding to the device grid according to the current heat value, wherein the temperature range is a range set according to the numerical value of the current heat value, such as 0 degrees to 10 degrees, 10 degrees to 20 degrees, etc.; In combination with the simulated grid diagram, the grid name and the temperature range, a device thermal image template of the electrical equipment is generated, and according to the temperature range, the device thermal image template is color rendered to obtain a device thermal image corresponding to the electrical equipment; wherein, the device thermal image template is an initial device thermal image corresponding to the electrical equipment, and has no specific color; further, generation of the device thermal image template of the electrical equipment can be achieved through the above-mentioned CAD tool in combination with the simulated grid diagram, the grid name and the temperature range, and color rendering of the device thermal image template can be achieved through a color rendering tool, such as the Kerkythea tool.

[0038] S32. The present invention extracts the material properties of the DC device, and constructs a wind field vector diagram inside the electrical equipment according to the material properties and the device parameters in step S22, so as to understand the air flow conditions inside the electrical equipment through the wind field vector diagram, and facilitate subsequent thermal updates of the thermal image of the equipment, wherein the material properties are characteristic attributes of the constituent materials of the DC device, and the wind field vector diagram is an air flow velocity distribution diagram inside the electrical equipment. Furthermore, the extraction of the material properties of the electrical equipment can be achieved by stable isotope analysis.

[0039] As an embodiment of the present invention, constructing a wind field vector diagram inside the electrical equipment according to the material properties and the device parameters is specifically: Extract physical and chemical properties of the material properties: Calculate the radiation consumption coefficient of each DC device in the electrical equipment according to the chemical properties, wherein the chemical properties are the chemical-specific properties of the material properties, such as mechanical properties, thermal properties, etc., and the radiation consumption coefficient is the radiation consumption of each DC device in the electrical equipment; Calculating the radiation absorption rate of each DC device in the electrical equipment according to the physical characteristics, wherein the physical characteristics are the physical properties of the material characteristics, such as heat capacity, conductivity and the like, and the radiation absorption rate is the radiation absorption of each DC device in the electrical equipment; Furthermore, the physical and chemical properties of the material properties can be extracted by using an extraction function, such as a left function; Furthermore, the calculation formula for the radiation consumption coefficient of each DC device in the electrical equipment is: , where is the radiation consumption coefficient, is the Stefan-Boltzmann constant, and P is the heat transfer coefficient in the chemical property; the radiation absorption rate of each DC device in the electrical equipment can be obtained by calculating the ratio of the initial radiation to the residual radiation.

[0040] Further, as an optional embodiment of the present invention, the step of calculating the radiation absorption rate of each DC device in the electrical device according to the physical characteristics includes: The radiation absorption rate of each DC device in the electrical equipment is calculated by the following formula: ; In the formula, Indicates the radiation absorption rate of each DC device in the electrical equipment. represents the heat transfer coefficient in the physical properties, y represents the device serial number of each DC device in the electrical equipment, Indicates the current value of the yth device in the electrical equipment, Indicates the resistance value of the yth device in the electrical equipment, Indicates the operating frequency of the yth device in the electrical equipment.

[0041] Determining the device thickness of each DC device in the electrical equipment according to the device parameters; Calculate the heat absorption coefficient of each DC device in the electrical device by combining the radiation consumption coefficient, the radiation absorption rate and the device thickness, wherein the heat absorption coefficient is the heat absorption condition of each device in the electrical device; Further, as an optional embodiment of the present invention, the heat absorption coefficient of each DC device in the electrical device is calculated by combining the radiation consumption coefficient, the radiation absorption rate and the device thickness, specifically: The heat absorption coefficient of each DC device in the electrical equipment is calculated by the following formula: ; In the formula, It represents the heat absorption coefficient of the jth device in the electrical equipment, and j represents the device serial number of the electrical equipment. represents the device thickness corresponding to the jth device, represents the radiation consumption coefficient corresponding to the jth device, Represents the radiation absorption rate corresponding to the jth device.

[0042] The difference in heat absorption coefficients of adjacent DC devices in the electrical equipment is calculated based on the heat absorption coefficient, and the air flow rate of adjacent DC devices in the electrical equipment is determined based on the difference in heat absorption coefficients, where the air flow rate = difference in heat absorption coefficients / air heat transfer coefficient, and the air heat transfer coefficient is a heat transfer characteristic parameter of air, which can be obtained by searching in the literature of heat transfer textbooks; the construction of the wind field vector diagram inside the electrical equipment can be achieved by numerical simulation, and the specific steps are: drawing a vector diagram inside the electrical equipment through drawing software, such as vector graphics processing software Adobe Illustrator and flowchart and vector drawing software Microsoft Visio, etc., drawing corresponding flow rate points in the vector diagram according to the position of the air flow rate, and drawing a vector starting from the flow rate point through the vector drawing function in the tool, and the corresponding length and range can be set according to the speed of the air flow rate, so as to generate a wind field vector diagram.

[0043] The present invention updates the device thermal image according to the wind field vector diagram so as to obtain an accurate heat distribution diagram, wherein the target device thermal image is a cloud diagram obtained after the device thermal image is updated according to the wind field vector diagram. Further, according to the corresponding air flow rate in the wind field vector diagram, the heat loss value of each DC device is calculated, and the formula is expressed as: heat loss value = air mass flow rate × constant pressure specific heat capacity of air × temperature change value of the DC device, wherein the air mass flow rate can be calculated by the air flow rate and the corresponding cross-sectional area in the wind field vector diagram, can be measured by a calorimeter tool, and the temperature change of the DC device can be measured by a thermometer; the mapping relationship between heat and color, brightness and contrast in the device thermal image is analyzed, and the color, brightness and contrast of the device thermal image are adjusted according to the mapping relationship and the loss value to obtain the target device thermal image.

[0044] S4. Obtain historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, set the compensation temperature of the electrical equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment to obtain metering data.

[0045] The present invention obtains historical metering data of the electrical equipment, and analyzes the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, so as to understand the relationship between the ambient temperature and the metering accuracy and facilitate the subsequent improvement of the metering accuracy of the DC power, wherein the historical metering data is the data of the previous metering of the electrical equipment, and the mapping relationship is the correlation relationship between the ambient temperature and the metering accuracy.

[0046] As an embodiment of the present invention, the mapping relationship between the ambient temperature of the electrical equipment and the measurement accuracy is analyzed according to the historical measurement data, specifically: Extracting environmental data and metered electric energy data from the historical metering data, wherein the environmental data is environmental data of the electric device when it was previously metered, such as temperature and use environment, and the metered electric energy data is data of electric energy previously metered by the electric device. Further, extracting environmental data and metered electric energy data from the historical metering data can be achieved by the above-mentioned left function; According to the environmental data, construct an environmental temperature curve of the electrical equipment, wherein the environmental temperature curve is a curve constructed by the numerical value of the environmental temperature of the electrical equipment, and further, constructing the environmental temperature curve of the electrical equipment can be realized by using Visio drawing tool; According to the metered electric energy data, a metered electric energy curve of the electric device is constructed, wherein the metered electric energy curve is a curve constructed by the electric energy values ​​in the metered electric energy data. The metered electric energy curve of the electric device is constructed in the same principle as the ambient temperature curve, and will not be described in detail. The slopes of the ambient temperature curve and the metered electric energy curve are calculated respectively to obtain a first curve slope and a second curve slope, wherein the first curve slope and the second curve slope respectively represent the inclination of the ambient temperature curve and the metered electric energy curve, and the slopes of the ambient temperature curve and the metered electric energy curve are calculated in the same principle as the image slope of the fitted current graph, which will not be described in detail here; According to the slope of the first curve and the slope of the second curve, the mapping relationship between the ambient temperature of the electrical equipment and the measurement accuracy is analyzed. Further, the mapping relationship between the ambient temperature of the electrical equipment and the measurement accuracy can be obtained by analyzing the relationship between the slope of the first curve and the slope of the second curve through a linear function.

[0047] The present invention determines the compensation temperature of the thermal image of the target device, and measures the DC electric energy corresponding to the electrical equipment according to the compensation temperature and the thermal image of the target device, so as to perform temperature compensation on the thermal image of the target device and improve the accuracy of the thermal image of the target device, wherein the compensation temperature is an adaptive temperature provided to avoid the influence of the ambient temperature on the temperature of the electrical equipment. Furthermore, the compensation temperature of the thermal image of the target device is determined by establishing an algorithm through a mapping relationship, such as a linear regression algorithm, and the existing ambient temperature is substituted into the linear regression algorithm to calculate the corresponding compensation temperature, for example, compensation temperature = ambient temperature × regression coefficient 1 + regression coefficient 2, regression coefficient 1 and regression coefficient 2 are coefficients obtained by performing linear regression analysis on the historical measurement data.

[0048] As an embodiment of the present invention, the DC power of the electrical equipment is measured according to the compensation temperature and the thermal image of the target equipment, including: measuring the equipment area of ​​the thermal image of the target equipment, reading the distribution temperature value in the thermal image of the target equipment, calculating the temperature gradient corresponding to the thermal image of the target equipment according to the distribution temperature value, and combining the temperature gradient and the equipment area to calculate the overall heat loss of the thermal image of the target equipment by the following formula: ; Among them, Y represents the overall heat loss of the target device thermal image, k represents the thermal conductivity of the device, s represents the area of ​​the device, represents the temperature gradient, The electric energy conversion rate corresponding to the electric device is queried, and the DC electric energy of the electric device is measured by the following formula in combination with the overall heat loss of the thermal image of the target device and the electric energy conversion rate: ; Among them, M represents the DC power of the electrical equipment, Indicates the effective output power of the electrical equipment. represents the overall heat loss, Indicates the effective input power of the electrical equipment.

[0049] Among them, the temperature gradient is the temperature change rate corresponding to the thermal image of the target device, the device thermal conductivity is the thermal conductivity of the electrical equipment, which can be obtained by querying the thermal conductivity of the material of the electrical equipment. Furthermore, based on the distributed temperature value, the average distributed temperature value of the thermal image of the target device is calculated, and the temperature gradient is obtained by dividing the average distributed temperature value by the device length of the target device. The effective output power of the device and the effective input power of the device can be obtained by directly measuring the electrical equipment using a power meter.

[0050] The present invention obtains the electrical equipment and equipment access voltage of the DC electric energy to be measured, identifies the equipment components in the electrical equipment, can understand the internal components of the electrical equipment and the voltage conditions in the access equipment, and facilitates the subsequent calculation of the device current of the DC device. The present invention performs noise reduction processing on the real-time current in the DC device, can remove the interference and noise in the real-time current, and improve the calculation accuracy of the subsequent device current value. The present invention calculates the heat value corresponding to the device current value, and can obtain the specific heat value corresponding to the device current value, so as to facilitate the subsequent construction of the device thermal image. The present invention obtains the historical measurement data of the electrical equipment, and analyzes the mapping relationship between the ambient temperature of the electrical equipment and the measurement accuracy according to the historical measurement data, so as to understand the relationship between the ambient temperature and the measurement accuracy, so as to facilitate the subsequent improvement of the measurement accuracy of the DC electric energy. Therefore, a DC electric energy measurement method based on a temperature field provided in an embodiment of the present invention can improve the accuracy of DC electric energy measurement based on a temperature field.

[0051] Embodiment 2 like Figure 2 As shown, an embodiment of the present invention provides a direct current electric energy metering device 100 based on a temperature field.

[0052] The DC power metering device 100 based on temperature field described in the present invention can be installed in an electronic device. According to the functions to be implemented, the DC power metering device 100 based on temperature field includes a device screening module 101, a current calculation module 102, a device thermal image construction module 103 and a DC power metering module 104. The module described in the present invention can also be called a unit, which refers to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, which are stored in the memory of the electronic device.

[0053] In this embodiment, the functions of each module / unit are as follows: The device screening module 101 is used to obtain the electrical equipment and device access voltage of the DC electric energy to be measured, identify the device components in the electrical equipment, obtain the real-time current value of each device in the device components through real-time detection, and determine the DC devices in the device components according to the real-time current value, wherein the determining the DC devices in the device components according to the real-time current value is specifically to draw a current scatter plot of each device in the device components according to the real-time current value, perform fitting processing on the current scatter plot, and obtain a fitted current graph; calculate the image slope of the fitted current graph, analyze the image slope, and determine the DC devices in the electrical equipment; The current calculation module 102 is used to perform noise reduction processing on the device current in the DC device to obtain the device noise reduction current, query the device parameters of the DC device, and calculate the device current value corresponding to the DC device according to the device noise reduction current, the device access voltage and the device parameters; The device thermal image construction module 103 is used to calculate the current calorific value corresponding to the device current value, and construct the corresponding device thermal image according to the current calorific value; extract the material properties of the DC device, and construct a wind field vector diagram according to the material properties and device parameters; update the device thermal image according to the wind field vector diagram to obtain the target device thermal image; The DC power metering module 104 is used to obtain the historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, and determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; based on the compensation temperature and the thermal image of the target equipment, measure the DC power of the electrical equipment to obtain the metering data of the DC power.

[0054] In detail, the modules described in the DC power metering device 100 based on temperature field described in the embodiment of the present invention adopt the same technical means as the DC power metering method based on temperature field described in Example 1 when in use, and can produce the same technical effects, which will not be repeated here.

[0055] Embodiment 3 like Figure 3 As shown, an embodiment of the present invention provides an electronic device 1 for a DC electric energy metering method based on a temperature field.

[0056] The electronic device 1 includes a processor 10, a memory 11, a communication bus 12 and a communication interface 13, and also includes a computer program stored in the memory 11 and executable on the processor 10, such as a DC electric energy metering method program based on a temperature field.

[0057] In some embodiments, the processor 10 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 10 is the control core (ControlUnit) of the electronic device 1, and uses various interfaces and lines to connect various components of the entire electronic device, and executes various functions of the electronic device and processes data by running or executing programs or modules stored in the memory 11 (for example, executing a DC power metering method program based on a temperature field, etc.), and calling data stored in the memory 11.

[0058] The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a mobile hard disk, a multimedia card, a card-type memory (for example, SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of an electronic device, such as a mobile hard disk of the electronic device. In other embodiments, the memory 11 may also be an external storage device of an electronic device, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the memory 11 may also include both an internal storage unit of the electronic device and an external storage device. The memory 11 can not only be used to store application software and various types of data installed in the electronic device, such as a code of a DC electric energy metering method program based on a temperature field, but also can be used to temporarily store data that has been output or is to be output.

[0059] The communication bus 12 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The bus is configured to realize connection and communication between the memory 11 and at least one processor 10, etc.

[0060] The communication interface 13 is used for communication between the above-mentioned electronic device 1 and other devices, including a network interface and a user interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is generally used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface may also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode, organic light-emitting diode) touch device, etc. Among them, the display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0061] Figure 3 Only an electronic device with components is shown, and those skilled in the art will understand that Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0062] For example, although not shown, the electronic device 1 may also include a power source (such as a battery) for supplying power to various components. As a preferred embodiment of the present invention, the power source may be logically connected to the at least one processor 10 through a power management system, so that the power management system can realize functions such as charging management, discharging management, and power consumption management. The power source may also include any components such as one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators. The electronic device 1 may also include a variety of sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be repeated here.

[0063] It should be understood that the embodiment is for illustration only and the scope of the patent application is not limited to this structure.

[0064] The program of a DC electric energy metering method based on a temperature field stored in the memory 11 of the electronic device 1 is a combination of multiple instructions. When running in the processor 10, it can achieve: Obtain the electrical equipment and equipment access voltage of the DC electric energy to be measured, identify the DC devices in the electrical equipment, perform noise reduction processing on the real-time current of the DC devices, obtain the device noise reduction current, query the device parameters of the DC devices, and calculate the device current value corresponding to the DC devices according to the device noise reduction current, the equipment access voltage and the device parameters; Calculate the corresponding current calorific value according to the device current value, and construct a device thermal image according to the current calorific value; extract the material properties of the DC device, construct a wind field vector diagram according to the material properties and device parameters, and update the device thermal image according to the wind field vector diagram to obtain a target device thermal image; Acquire historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

[0065] Specifically, the specific implementation method of the processor 10 for the above instructions can refer to the same technical means as the direct current power metering method based on temperature field described in the first embodiment, which will not be repeated here.

[0066] Furthermore, if the module / unit integrated in the electronic device 1 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or system that can carry the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM).

[0067] Embodiment 4 An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, the computer program can implement: Obtain the electrical equipment and equipment access voltage of the DC electric energy to be measured, identify the DC devices in the electrical equipment, perform noise reduction processing on the real-time current of the DC devices, obtain the device noise reduction current, query the device parameters of the DC devices, and calculate the device current value corresponding to the DC devices according to the device noise reduction current, the equipment access voltage and the device parameters; Calculate the corresponding current calorific value according to the device current value, and construct a device thermal image according to the current calorific value; extract the material properties of the DC device, construct a wind field vector diagram according to the material properties and device parameters, and update the device thermal image according to the wind field vector diagram to obtain a target device thermal image; Acquire historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

[0068] It is worth noting that in the several embodiments provided by the present invention, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

[0069] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0071] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0072] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any attached figure mark in the claims should not be regarded as limiting the claims involved.

[0073] The embodiments of the present invention can acquire and process relevant data based on artificial intelligence technology. Artificial Intelligence (AI) is the theory, method, technology and application system that uses digital computers or machines controlled by digital computers to simulate, extend and expand human intelligence, perceive the environment, acquire knowledge and use knowledge to obtain the best results.

[0074] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or systems stated in a system claim can also be implemented by one unit or system through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A DC electric energy measurement method based on temperature field, characterized in that: The method comprises: Obtain the electrical equipment and equipment access voltage of the DC electric energy to be measured, identify the DC devices in the electrical equipment, perform noise reduction processing on the real-time current of the DC devices, obtain the device noise reduction current, query the device parameters of the DC devices, and calculate the device current value corresponding to the DC devices according to the device noise reduction current, the equipment access voltage and the device parameters; Calculate the corresponding current calorific value according to the device current value, and construct a device thermal image according to the current calorific value; extract the material properties of the DC device, construct a wind field vector diagram according to the material properties and device parameters, and update the device thermal image according to the wind field vector diagram to obtain a target device thermal image; Acquire historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

2. A DC electric energy measurement method based on temperature field as claimed in claim 1, characterized in that: Identify DC devices in electrical equipment specifically as follows: Obtaining a real-time current value of each device in the electrical equipment through real-time detection, drawing a corresponding device current scatter diagram according to the real-time current value, and performing fitting processing on the device current scatter diagram to obtain a fitted current diagram; The image slope of the fitted current graph is calculated and expressed as: ； In the formula, represents the slope of the image of the fitted current graph, and Indicates the coordinates corresponding to the first real-time current in the fitted current diagram, represents the slope of the image line segment between the first real-time current and the second real-time current, and Indicates the coordinates corresponding to the nth real-time current in the fitted current graph, where n represents the number of real-time currents; The direct current components in the electrical equipment are determined according to the image slope.

3. A DC electric energy measurement method based on temperature field as claimed in claim 2, characterized in that: The real-time current of the DC device is subjected to noise reduction processing to obtain the device noise reduction current: Extracting the current signal of the real-time current of the DC device, calculating the wavelet coefficient corresponding to each signal in the current signal, and obtaining the signal wavelet coefficient; Performing shrinkage processing on the wavelet coefficients of the signal to obtain a threshold coefficient in the signal; According to the threshold coefficient in the signal, the real-time current in the DC device is subjected to median filtering to obtain the device noise reduction current.

4. A DC electric energy measurement method based on temperature field as claimed in claim 3, characterized in that: According to the device noise reduction current, equipment access voltage and device parameters, the device current value corresponding to the DC device is calculated as follows: Determine the device resistance of the resistor device in the DC device according to the device parameters, and query the service life of the resistor device; According to the use cycle, the loss coefficient of the resistor device is searched from a preset resistance cycle loss table, and the actual device resistance of each device in the DC device is determined according to the loss coefficient and the device resistance; Obtaining a circuit topology diagram of an electrical device, and analyzing the device relationship of the DC devices according to the circuit topology diagram; The connection mode of the DC device is determined by the device relationship, and the device current value is calculated using different device current formulas according to different connection modes of the DC device, wherein: if the connection mode is series connection, the device current calculation formula is: I=U / R, where I is the device current, U is the device access voltage, and R is the actual device resistance; If the connection mode is parallel connection, the device current calculation formula is: I=U / R1+R2 Rm, where Rm represents the actual device resistance of the mth device.

5. A DC electric energy measurement method based on temperature field as claimed in claim 4, characterized in that: The corresponding current heat value is calculated according to the device current value, and the device thermal image is constructed according to the current heat value, specifically: The current calorific value is calculated according to the calorific value formula and expressed as: Q= Rt; In the formula, Q represents the current heat value, represents the device current value, R represents the actual device resistance corresponding to the DC device, and t represents the time for the current to pass through the DC device; Performing hierarchical grid processing on the electrical equipment to obtain an equipment grid, and constructing a simulated grid diagram of the electrical equipment based on the equipment grid; Querying the grid name corresponding to the device grid, and setting the temperature range corresponding to the device grid according to the current heat value; Generate a device thermal image template of the electrical device by combining the simulated grid diagram, the grid name and the temperature range; According to the temperature range, the device thermal image template is rendered in color to obtain a device thermal image corresponding to the electrical device.

6. A DC electric energy measurement method based on temperature field as claimed in claim 5, characterized in that: According to the material characteristics and device parameters, a wind field vector diagram is constructed, specifically: Extracting physical and chemical properties from the material properties, and calculating the radiation consumption coefficient of each DC device in the electrical equipment according to the chemical properties; Calculating the radiation absorption rate of each DC device in the electrical equipment according to the physical characteristics; Determining a device thickness according to the device parameters; Calculate the heat absorption coefficient by combining the radiation consumption coefficient, the radiation absorption rate and the device thickness; Calculating the difference in heat absorption coefficients of adjacent DC electrical devices in the electrical equipment based on the heat absorption coefficients; The air flow rate of adjacent DC components in the electrical equipment is determined according to the difference in heat absorption coefficients, and a wind field vector diagram inside the electrical equipment is constructed according to the air flow rate.

7. A DC electric energy measurement method based on temperature field as claimed in claim 6, characterized in that: The calculation of radiation consumption coefficient is expressed as: ； In the formula, is the radiation consumption coefficient, is the Stefan-Boltzmann constant, P is the heat transfer coefficient in chemical properties; The calculation of radiation absorption rate is expressed as: ； In the formula, Indicates the radiation absorption rate of each DC device in the electrical equipment. represents the heat transfer coefficient in the physical properties, y represents the device serial number of each DC device in the electrical equipment, Indicates the current value of the yth device in the electrical equipment, Indicates the resistance value of the yth device in the electrical equipment, Indicates the operating frequency of the yth device in the electrical equipment.

8. A DC electric energy measurement method based on temperature field as claimed in claim 7, characterized in that: Combining the radiation consumption coefficient, radiation absorption rate and device thickness, the heat absorption coefficient of each DC device in the electrical equipment is calculated and expressed as: ； In the formula, The heat absorption coefficient of the jth device in the electrical equipment, where j represents the device serial number of the electrical equipment. represents the device thickness corresponding to the jth device, represents the radiation consumption coefficient corresponding to the jth device, Represents the radiation absorption rate corresponding to the jth device.

9. A DC electric energy measurement method based on temperature field as claimed in claim 8, characterized in that: According to the compensation temperature and the thermal image of the target device, the DC power of the electrical device is measured, specifically: Measuring the device area of ​​the thermal image of the target device and reading the distributed temperature value in the thermal image of the target device; Calculating the temperature gradient corresponding to the thermal image of the target device according to the distributed temperature value; Combining the temperature gradient and the device area, the overall heat loss of the target device thermal image is calculated and expressed as: ； Among them, Y represents the overall heat loss of the target device thermal image, k represents the thermal conductivity of the device, s represents the area of ​​the device, represents the temperature gradient, The electric energy conversion rate corresponding to the electric device is queried, and the DC electric energy of the electric device is measured by combining the overall heat loss of the thermal image of the target device and the electric energy conversion rate, which is expressed as follows: ； Among them, M represents the DC power of the electrical equipment, Indicates the effective output power of the electrical equipment. Indicates the effective input power of the electrical equipment.

10. A DC electric energy metering device based on temperature field, characterized in that: The device comprises: A device screening module, used to obtain the electrical equipment and device access voltage of the DC electric energy to be measured, identify the device components in the electrical equipment, obtain the real-time current value of each device in the device components through real-time detection, and determine the DC devices in the device components according to the real-time current value, wherein the determining the DC devices in the device components according to the real-time current value specifically comprises drawing a current scatter plot of each device in the device components according to the real-time current value, fitting the current scatter plot to obtain a fitted current graph; calculating the image slope of the fitted current graph, analyzing the image slope, and determining the DC devices in the electrical equipment; A current calculation module, used to perform noise reduction processing on the device current in the DC device, obtain the device noise reduction current, query the device parameters of the DC device, and calculate the device current value corresponding to the DC device according to the device noise reduction current, equipment access voltage and device parameters; The device thermal image construction module is used to calculate the current calorific value corresponding to the current value of the device, and construct the corresponding device thermal image according to the current calorific value; extract the material properties of the DC device, and construct a wind field vector diagram according to the material properties and device parameters; update the device thermal image according to the wind field vector diagram to obtain the target device thermal image; A DC power metering module is used to obtain historical metering data of the electrical equipment, analyze the mapping relationship between the ambient temperature of the electrical equipment and the metering accuracy based on the historical metering data, determine the compensation temperature of the thermal image of the target equipment based on the mapping relationship; and measure the DC power of the electrical equipment based on the compensation temperature and the thermal image of the target equipment.

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